The follower combination you will be looking for is as follows at ilvl 672 or better

Danger Zone + Group Damage + High Stamina*Massive Strike + Timed Battle + Racial Success with party members**Powerful Spell + Wild AggressionMagic Debuff + Minion SwarmsMinion Swarms + Powerful SpellDeadly Minions + Minion Swarms* High Stamina will only work if you do not have a Mission Duration trait on any of the 6 followers. If you do then you will need Burst of Power and a Mission Duration trait in every mission. I will break down which followers go on which mission later in the guide to help you determine which followers need this.**The Racial Success with Party Members will have to match the race of your Danger Zone + Group Damage + High Stamina follower

There are a couple other 6 follower combinations, however this ability combination covers the most likely people will have due to the number of classes and specs that these combinations can be found in.

Here is a breakdown of what class and specs can have each combination.